add bent normals-based IBL anisotropy rendering.#2871
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bhouston wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
Open
add bent normals-based IBL anisotropy rendering.#2871bhouston wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
bhouston wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
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Using my MaterialX fidelity tool, https://materialx-fidelity.ben3d.ca, I noticed that the MaterialXView tool does not support anisotropy in IBL lighting. I suspect this is because it is attempting to be real-time, and thus does not want to do multiple samples in a biased lobe. It turns out there is a way to do effective anisotropy sampling using IBL at real-time via a single sample using a technique called bent normals. This method has been adopted by Filament, and Three.js at least. It is documented here:
https://google.github.io/filament/Filament.md.html#lighting/imagebasedlights/anisotropy
I have implemented that in this PR.
It converted this pre-bent normals image:
To this result from MaterialXView that now matches what Three.js produces:
I am using this material: https://materialx-fidelity.ben3d.ca/api/asset/open_pbr_surface/aluminum_brushed.mtlx.zip